code: def test_init(self):
      new_assessor = CurvefittingAssessor(20)
      self.assertEqual(new_assessor.start_step, 6)
      self.assertEqual(new_assessor.target_pos, 20)
  
file_path: nni/test/ut/sdk/test_curvefitting_assessor.py
imports: import numpy
  import unittest
  from nni.algorithms.hpo.curvefitting_assessor import CurvefittingAssessor
  from nni.algorithms.hpo.curvefitting_assessor.model_factory import CurveModel
  from nni.assessor import AssessResult
label_desc: Use image node_id 1 for calling the TestCurveFittingAssessor obj's underlying member method code with example usage: obj.test_init() without return types